prd-v05-technical-stack-selection

Determine technologies needed to build the product, making build/buy/integrate decisions during PRD v0.5 Red Team Review. Triggers on requests to select tech stack, evaluate technologies, make build vs. buy decisions, or when user asks "what technologies?", "select tech stack", "build or buy?", "technical decisions", "what tools do we need?", "evaluate solutions". Consumes FEA- (features), SCR- (screens), RISK- (constraints). Outputs TECH- entries with decisions, rationale, and trade-offs. Feeds v0.6 Architecture Design.